Work-supporting adjustable mandrel for band saws



June 7, 1949. s. J. A.CHRISTIE 9 5 WORK-SUPPORTING ADJUSTABLE MANDREL FOR BAND SAWS File d Aug. 1944 3 Sheets-Sheet ATTYS.

WORK-SUPPORTING ADJUSTABLE MANDREL FOR BAND SAWS 4 June 7, 1949.' S.-J. A. CHRISTIE 3 Shee'ts-Sheet 2 Filed Aug. 11,- 1944 :5 5. I'gJcL NVENTUF\ S ALHRIETIE A'r -rv June 7, 1949. 5.4. A. CHRIS-'PIE WORK-SUPPORTING DJUSTABLE-MANDREL FOR BAND SAWS 3 sheets-she c s Filed Au ;944

m DS TI., m V

Patentecl June 7, 1949 UNHTE@ STATES PATENT OFFICE WORK-SUPPORTING ADJUSTABLE MAN- DREL FOR. BAND SAWS 2 Claims. i

The invention relates to an adjustable mandrel for band saws and the like.

It is an object of this invention to provide a mandrel unit for band saws and the like having pedestal means on which a work-piece may be swingably supported during the cutting operation.

It is also an object of this invention to provide a mandrel unit for band saws and the like which is easily and quickly removed or secured to the work table or machine frame of an existing machine and which is adjustab-le as to position on such work table or machine frame.

It is a further object of this invention to provide an adjustable manclrel unit for band saws and the like having reciprocable pedestal means on which swingably to support a work-piece during cutting.

It is also a further object of this invention to provide a pedestal mandrel unit for band saws and the like having a, head portion on the pedestal which is fully adjustable in all dimensions and includes rotatable support means and guide means for the band saw.

A further object of this invention is to provide a pedestal mandrel unit for band saws and the like having a movable chassis reciprocable within a housing securable to a machine frame, the said housing including a fulcrumed member to lock said chassis in predetermined position in said housing.

Present day band saw machines, whilst sometimes having meaens thereon for preventing sawchatter or vibration, are in general ill adapted for properly supporting work-pieces during the cutting operation itself.

The work support meaens now in general use consists of the flat work table of the machine and to those skilled in the art it is well known that the task of cutting curved or recessed material, even in sheet form, is often a dangerous and wasteiul operation denanding long experience and greata skill on the part of the operator, the results, notwithstanding, being always uncertain and generally far from accurate.

Moreover, work-pieces having projecting portions which must be accurately cut for such work as jigs and fixtures, must, on existing machines, be very carefully supported by blocks or other means and despite great care and the spending of much time to build and secure such supports, it all too frequently happens that the vibration of the machine shakes them out of position during cutting, even when they are clamped, and faulty cutting necessarily results.

It will be evident that existing support structures for use in band sawing Operations are generally ineflicient and dangerous to the operator and in order to remedy these prevalent conditions the instant invention was devised.

In the drawings:

Figure 1 is a front elevational view of a mandrel unit according to the invention, secured to a machine table, the latter being shown in section.

Figure 2 is a sectional View on the line 2-2 in Figure 1,

Figure 3 is a front view of a modified mandrel unit having an adjustable head portion and a reciprocable pedestal.

Figure 4 is a sectional view on the line 4--4 in Figure 3,

Figure 5 is a side elevational view of a modified pedestal head,

Figure 6 is a front elevational View of Figure 5,

Figure '7 is a front elevational view of an alternative type of pedestal head,

Figure 8 is a side elevational View of Figure 7,

Figure 9 is a, side elevational view of a modified pedestal head,

Figure 10 is a front elevational view of Figure 9,

Figure 11 is a front elevational View of a modified fully adjustable mandrel unit,

Figure 12 is a side elevational view of Figure 11,

Figure 13 is a sectional View on the line l3-l3 in Figure 11.

Referring to the drawings, it will be seen from Figures 1 and 2 that the invention in the simplest form generally comprises the pedestal l5 having a vertical slotted portion IS therein to contain and guide the band saw l'l. The pedestal is provided with a head portion a which may be of any convenient form, the shank portion l9 terminating in fianged portions 20 which form support means to maintain the pedestal upright on the machine table.

The pedestal preferably includes a lower projecting portion 2| designed to be secured in the upper recess 22 in the work table 23 of the machine frame 24. work table is formed with a :large recess 26 therein having the cut out slot 21 extending from the front portion of the work table to a point 28 rearwardly of the saw ll. In the lower central portion 29 of the pedestal is located a securing member 30 having the manual gripping portion 3| and the annular flange 32 reciprocably engageable with the adjacent fianged parts 33 and The under surface 25 of the 34 of the work table formed between the upper and lower recesses by the slot 21.

It Will be evident that after seating the rear portion 2& on the work table in the desired position and by manually screwing the member 3I, the head portion of the pedestal forms a support means for a flat or curved work-piece which may be swung thereon to enable any desired shape to be cut from the work-piece.

It is evident that the pedestal may be moved forwardly or rearwardly relative to the saw within the limits of the slot 16 and may be secured in a desired position by the member 3l.

As seen in Figures 3 and 4, the pedestal may be formed as a member axially reciprocable within a housing 33 eing positionable therein by set screws and 35 engageable respectively with difierent faceted portions 36 and 31 of the pedestal. The housing is provided with an annular flange 38 adjustably securable to the work table by the members 39.

Fignres 5 to 10 inclusve illustrate alternative types of adjustable heads which may be secured to the upper extremity 42 of the reciprocable pedestal. In Figures 5 and 6 the pedestal head ii has a transverse recess 10 securable to the corresp nding extremity of the pedestal by the members &3. The inner extremities 44 of members 43 are seated in adjacent depressions 45 which permit transverse adjustment of the head. The pedestal head t'i is provided with the ways 63 on which the crown piece 49 is movable, being secured therealong by the set screw '50. To the front surface 5! of the croWn piece is secured the stop member 52 located on one side of the slot 53 which extends from the apex 54 of the crown piece and through the front of the member i?, the stop member being rigidly securable by a screw and provided to prevent the crown piece leaving the ways and to prevent the rear &E of the slot from coming into contact with the rear wall of the saw by inadvertent sliding move ment of the crown piece.

In the alternative form of movable crownpiece illustrated in Figures '7 and 8, the upper surface 55 is formed with an S-curve to enable certain types of curved work-pieces to be more compieteiy swingably and angularly supported thereon.

Figures 9 and 10 illustrate a simple domed and slotted crown piece 51 securable directly to the extremity of the pedestal and adapted for use preferably on the type of pedestal illustrated in Figures and 4.

For precision work, the fully adjustable mandrel, as shown more particularly in Figures 11 to !3 inclusive, is provided comprising the housing 58 securable to a machine frame 59 by the member Gi) and the pin Gi engageable respectively with the threaded aperture 63 and the orifice 64 in the machine frame.

In order accurately to align the housing 58 to the saw 65, the adjustable pins 66 are provided in the housing, their extremities hearing up against the surface 67 of the frame. As best seen in Figure 13 the housing is formed as a U- shaped member having a central guideway in which is reciprocable the U- shaped chassis 68 of the pedestal. The chassis is positionable in relation to the housing by the members 69 and iii, the latter being threadedly secured through the front portion ll of the housing and being engageable with the front of the U-shaped chassis 53.

In order rigidly to lock the chassis to the housing 58 after positioning, the L-shaped member 72 is provided. This member, best seen in Figure 13, has a raised portion 73 adjacent to and bearing on the inner surface 74 of the housing. The fulcrumed member 72 is formed With a retaining fiange portion 75, the inner surfaces of which are engageable with the reciprocable chassis 68. Member 12 is oriced to contain members 60 and 76 and is securable by leverage exe'ted through the th'eaded member 16, the extremity of which is secured in the rear part 11 of the housing 58, as best seen in Figura 12.

The upper end of the pedestal may be provided with any of the alternative types of head member and as illustrated includes the slotted and movable crown-piece 78 having the adjustable siotted saw guides 729 disposed on both sides of the slot and securable by the members a. In addition, a rotatable member 80 is secured in the member to support the saw during movement.

It will be evdent that an adjustable mandrel for band saws and the like has been provided which fully meets the objects to be attained and that changes or modioations may be made to the preferred embodiments described herein within the scope and nature of the appended clairns.

What I claim as my invention is:

1. A mandrel for band saws and the like com prising a housing, means for securing said housing to a band saw table, set screw means for aligning said housing with the saw blade, a chassis adapted to carry a pedestal for supporting the work, said pedestal having a head nd means for adjusting said head in a horizontal plane along a line aligned with said blade and along a line perpendicular to said aligned line.

2. A mandrel for band saws and the like as claimed in claim 1, in which said means for aligning the housing with the saw blade comprises a plurality of spaced apart screws adapted to thread in said housing and to bear against said table at spaced apart intervals for the purpose of aligning the housing with the saw blade.

STANLEY J. A. CHRISTIE.

REFEREN CES CITED The following refe'ences are of record in the file of this patent:

UNITED STATES PATENTS N ?be Name Date 142361 Walker Sept. 2, 1873 39.2,118 Hammond Oct. 30, 1888 39.5,797 Perry Jan. 8, 1889 501887 Grifin Aug. 8, 1893 '758.619 Culpepper May 3, 1904 

